Molecules outside the cell often bring about intracellular responses by binding to a membrane receptor and stimulating a cascade of intracellular reactions, known as a signal-transduction pathway. Many molecules in the pathway are proteins that alternate between active and inactive forms. Defects in signal-transduction pathways are often associated with cancer.
-Ras proteins are activated when they

Question

Quizplus · Accepted Answer

Ras proteins are activated when they bind GTP, which allows them to transmit signals that can lead to cell growth and division.

Molecules Outside the Cell Often Bring About Intracellular Responses by Binding